People hug and pray before the procession carrying the body of Ventura County Sheriff Sgt. Ron Helus, who was killed in a mass shooting at the Borderline Bar and Grill, leaves Los Robles Hospital on November 8, 2018 in Thousand Oaks, California. 12 people have died including the sergeant plus the gunman. (Photo: David McNew/Getty Images)

Former U.S. Marine Ian David Long killed 12 people and injured dozens Wednesday night at a bar in Thousand Oaks, California. His weapon was purchased legally but was likely outfitted with a high capacity magazine banned in California. Long had previously attracted the attention of law enforcement, including a disturbance at his home that led to an evaluation by mental health specialists. We'll discuss the effectiveness of the state’s gun regulations, including California’s Gun Violence Restraining Order law, which allows weapons to be removed from those who present a threat to themselves or others.